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Stoichiometry MCQ Questions & Answers | Chemical Engineering

Learn Stoichiometry MCQ questions & answers are available for a Chemical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Stoichiometry MCQ question is the important chapter for a Chemical Engineering and GATE students.

Each section contains 100 MCQs on Stoichiometry .
1
A sample of well water contains 140 gm/m3 Ca2+ ions and 345 gm/m3 Na+ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO3 in gm/m3 is (assuming atomic masses of Ca : 40, Na : 23, C : 12, O : 16)
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Answer: Option A
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2
The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal __________ in the two phases.
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Answer: Option C
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3
The total number of atoms in 8.5 gm of NH3 is __________ × 1023.
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Answer & Solution
Answer: Option C
Solution:
The molecular weight of NH3 is 17 g/mol (Nitrogen = 14, Hydrogen = 1 × 3 = 3).

For 8.5 grams of NH3, the number of moles is calculated as:

Moles of NH3 = 8.5 / 17 = 0.5 moles.

The total number of molecules in 0.5 moles is:

0.5 × 6.02 × 1023 molecules.

Since each molecule of NH3 contains 4 atoms (1 nitrogen and 3 hydrogen), the total number of atoms is:

0.5 × 6.02 × 1023 × 4 = 12.04 × 1023 atoms.
4
Which of the following holds good for a solution obeying Raoult's law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing ) ?
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Answer: Option D
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5
Number of gm moles of solute dissolved in 1 kg of solvent is called its
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Answer: Option C
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6
If pH value of a solution is 8, then its pOH value will be
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Answer: Option A
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7
Solution made by dissolving equimolar amounts of different solutes in the same amount of a given solvent will have the
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Answer: Option A
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8
For estimation of heat capacity of a solid compound, one can use
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Answer: Option C
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9
Dissolving a solute in a solvent does not change its
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Answer: Option D
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10
Pick out the wrong statement.
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Answer: Option A
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